I've been having some issues with 14013 Dual D-flipflop failing. Unfortunately this is work related so i cant give very many details.
The devices have been analyzed under a microscope. but the supplier is only saying arcing and overheating.

I took a VLSI class in college, but that was a very long time ago. Looks like it is a positive output transistor that failed?

That output pin drives the base of an NPN transistor through a 9k resistor.
It also goes to a test header used for during manufacturing test. The pin is right next to the -15V supply test pin. The IC runs on +15V and Gnd, would the same damage occur if the output pin was shorted to -15V supply?

... would the same damage occur if the output pin was shorted to -15V supply?

Click to expand...

You tell me... What is the current if this happens? Does that current exceed the worst case maximum current of the device specification?

Hint - most ic output stages are protected in the following manner... either on purpose or parasitically (usually parasitically) - your device doesn't specify specifically, but if you have a few spares you can check for this sort of relationship with most quality DMMs.